Screw-driver.



Ba PRESSQN SCREW BEAVER.

APPLICATION FILED AUG. 26, 1908.

Patante. Dec.

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BERT riaasson, or ri'r rsisune, KANSAS.

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To all whom it may concern:

Be it known that I, BERT Prmsson, a citi zen of the United States, residing at Pitts burg, in the munty of Crawford and State of Kansas, have invented a new and useful ScrewDriver, of which the following is a specification.

This invention relates to screw drivers, and has for its object to provide a tool of this type with a simple and efiicient means for, holding a. screw in engagement with the bit of the driver so that said screw may be inserted into or removed from a part otherwise inaccessible.

To this end the invention comprises a sleeve rotatably mounted on the shank of a screw driver and connected thereto by a screw thread so that when said shank is rorated and the sleeve held'in one hand, the threaded connection causes said shank to move end-wise relatively to the sleeve. Connected to the lower end of the sleeve by' a swivel is a collar from which depend grasping fingers for holding a, screw in engagement with the screw driver. If desired the bit of the screw driver may be'projected beyond the fingers and used in the ordinary manner.

With these and'other objects in view, the invention consists of the novel combination. and arrangement "of parts hereinafter described and claimed and illustrated in the accompanying drawing, in which Figure 1 is a side elevation of the improved screw driver; Fig. 2 a longitudinal sectional view of the same; Fig. 3 a cross-see tion on the line .3-3'of"FifgI 2, and Fig. 4 a perspective view of the screw clamp or holder.

Like reference characters are used for the same parts in all the fi ures. c.

In the drawing, 1 indicates the c lindrical shank of a screw driver having a xed handle 2 at one end and a flat bit 3 at the opposite end as usual. i. Formed on the shank 1 at any convenient or desired position is a short left hand screw'thread 4, here shown as being just within the handle 2. Surrounding the shank for a suitable distance and rotatable thereon is a sleeve 5 threaded within to engage the screw 1 on the shank, and provided with an exterior knurled circular rib 6 for rotating the same. by the fingers when it is desiredto 'move the sleeve endwise on the shank. I Within the lower end of the sleeve 5 is Specification of Letters Patent.v

' shank Patented lDec '1? 190%.

Application filed August as, 190a Serial No. 450,382.

collar 7 with a rounded flange 8 on its lower end over which the end of the sleeve 5 is bent orspun to retain the collar in place and rotatev thereon. Projecting downwardly from the collar 7 are fingers 9, three being here shown, substantially parallel to the shank l, and having their lowerfends bent I inwardly toward the axisof said shank to form claws 10 for grasping a screw. Intermediate the length of each finger 9 on its inner side is a protuberance 11 adapted to enter depressions 12 and 13 cut out of the' shank 1, leaving an elevated portion 14 between them.

To use the tool, the screw d: iver in the position shown in Fig. 2 with the end of the bit projecting, the bit will be placed in the nick in the head of the screw to be removed and the screw driver turned to the left as usual, the sleeve being held stationarv. As the screw begins to draw out, the

left hand thread 4 on the shank forces the sleeve 5 relatively toward the screw causing the protuberances on the fingers to ride out of the depressions 13 onto the elevations 14, thus spreading the claws 10 far enough apart to permit them to pass over the screw headand grasp the screw below, its head as the protuberances are carried into the depressions 12. The sleeve may now be released and the screw driver continued to be turned until the screw is removed, it being retained by the bit of the screw driver and the claws 10, see Fig. 1.

When a screw is to be inserted, it may be placed in the screw driver in any convenient manner and then inserting the screw at the desired place, the screw driver is turned to the right, the hand holding the sleeve from turning. The left hand screw causes a re verse movement of the fingers and again spread the claws thereon to release the head of thescrew while it is being driven home.

' c What is claimed is'::- l

e 1. In a device of the class described, a threaded adjacent one of its ends and being provided with protuberances and depressions adjacent its other end; a collar r0 tatably mounted u on the shank and being provided with resi ient fingers'having protuberances to engage the depressions and protuberances upon the shank; and a sleeve swiveled to the collar and being threaded to eng'a e the shank.

2. 1 a device. of the class described, a shank threaded adjacent one of its ends and being 'providedwith protuberances" and deand being inbent terminally to engage the pressions adjacent its other end; a collarrorounded head thereof. tatably mounted upon the shank and having In testimony that I claim the foregoing a rounded head, the said collar being proas my own, I have hereto affixed my signa- 5 vided with resilieiilt fifi gers having pdi'otuberture in the presence of two witnesses. ances to en a e t e e ressions an rotut berance s up in the shanh; and a sleeve rota- I B PRESSON' tably mounted upon the shank and being Witnesses:

threaded to engage the shank, the said LIZZIE Rorrz, 0 sleeve being arrangedto inclose the collar EDGAR LEWIS. 

